Regensburg ( ; historically also Ratisbon, from Celtic Ratisbona, Latin: Castra Regina) is a city in Bavaria, Germany, located at the confluence of the Danube and Regen rivers, at the northernmost bend in the Danube. To the east lies the Bavarian Forest. Regensburg is the capital of the Bavarian administrative region Upper Palatinate. The large medieval centre of the city is a UNESCO World Heritage Site.

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